how to add external link to top menu

I'm currently using the default theme and cPanel. I would like to add a button to the top menu / nav bar that says "HOME " and it takes members to my home page (I would also like to add one that says classifieds and takes them to my e-commerce page - and i would hope the solution is much the same)
I've never done a successful code mod before and I would appreciate detail in a simple solution.
Would be even better if there was a plugin/theme that could do this.

Other options would be:
to have; My logo = Homepage link,
or,
A message header with a coded hyper link (what code to put in it?)
or,
a side bar link.

Any help on ANY of these solutions appreciated. Hell, i could use more than one option!

Background:
I'm sure this has been requested many times, but i couldn't find my solution